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AIX Version 4.3 Communications Technical Reference, Volume 2
getpmsg System Call
Purpose
Gets the next priority message off a stream.
Syntax
#include <stropts.h>
int getpmsg (fd, ctlptr, dataptr, bandp, flags)
int fd;
struct strbuf *ctlptr;
struct strbuf *dataptr;
int *bandp;
int *flags;
Description
The getpmsg system call is identical to the getmsg system call, except that the message priority can be specified.
Parameters
fd |
Specifies a file descriptor referencing an open stream. |
ctlptr |
Holds the control part of the message. |
dataptr |
Holds the data part of the message. |
bandp |
Specifies the priority band of the message. If the value of the bandp parameter is set to 0, then the priority band is not limited. |
flags |
Indicates the type of message priority to be retrieved. Acceptable values are:
MSG_ANY |
Process the next message of any type. |
MSG_BAND |
Process the next message only if it is of the specified priority band. |
MSG_HIPRI |
Process the next message only if it is a priority message. |
If the value of the flags parameter is MSG_ANY or MSG_HIPRI, then the bandp parameter must be set to 0. |
Implementation Specifics
This system call is part of the STREAMS Kernel Extensions.
Related Information
The poll subroutine, read subroutine, write subroutine.
The getmsg system call, putmsg system call, putpmsg system call.
List of Streams Programming References and STREAMS Overview in AIX Version 4.3 Communications Programming Concepts.
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